You can now upgrade a retro Casio watch with Bluetooth, step tracking, and games

The DIY version of the Ollee Watch one, which requires you to already have one of six different supported Casio watch models ...
Liliputing

Ollee Watch brings smartwatch features to the Casio F-91W with a mainboard replacement

The Ollee Watch features an ARM Cortex-M4/M0+ low-power processor with support for Bluetooth Low Energy and a programmable NTAG213 NFC tag (although this is said to only be compatible with the F-91W ...

I tried the CMF Watch Pro 3, and here's why I'm so disappointed with it

You’ll be disappointed by its looks and presence on your wrist, almost regardless of whether you’ve worn any kind of other ...

Is your Oura Ring losing battery life? Here's the solution

The bad news is Oura Ring 4's battery life is weakening, one year after it debuted. The good news is Oura is fixing the issue.
Liliputing

casio f-91w

The Casio F-91W is a classic digital wristwatch that’s been in constant production since it was first released in 1989. With a $20 starting price, the watch offers a water resistant design, an LED ...